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Mon, 5 Sep 2022 16:56:41 +0000 From: Andrea Corallo To: Andrea Corallo via Gcc-patches CC: Richard Earnshaw , nd Subject: Re: [PATCH 12/15] arm: implement bti injection References: Date: Mon, 5 Sep 2022 18:56:41 +0200 In-Reply-To: (Andrea Corallo via Gcc-patches's message of "Fri, 12 Aug 2022 17:41:42 +0200") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.1.50 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-EOPAttributedMessage: 1 X-MS-Office365-Filtering-Correlation-Id: 7950682d-a8b5-4fea-1d16-08da8f5fa163 X-MS-TrafficTypeDiagnostic: AS8PR08MB9839:EE_|VE1EUR03FT058:EE_|AS8PR08MB9669:EE_ x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; X-Microsoft-Antispam-Message-Info-Original: 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 X-Forefront-Antispam-Report-Untrusted: CIP:40.67.248.234;CTRY:IE;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:nebula.arm.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230016)(4636009)(136003)(396003)(346002)(376002)(39860400002)(46966006)(36840700001)(40470700004)(26005)(5660300002)(336012)(186003)(426003)(84970400001)(47076005)(36756003)(8936002)(40480700001)(2616005)(44832011)(2906002)(41300700001)(86362001)(478600001)(81166007)(36860700001)(83380400001)(356005)(82310400005)(4326008)(8676002)(316002)(54906003)(40460700003)(70586007)(6916009)(70206006)(82740400003)(36900700001);DIR:OUT;SFP:1101; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Sep 2022 16:56:51.7545 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7950682d-a8b5-4fea-1d16-08da8f5fa163 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: VE1EUR03FT058.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB9669 X-Spam-Status: No, score=-6.0 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,FORGED_SPF_HELO,KAM_DMARC_NONE,KAM_SHORT,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE,TXREP,T_SCC_BODY_TEXT_LINE,UNPARSEABLE_RELAY autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: Andrea Corallo via Gcc-patches writes: > Hi all, > > this patch enables Branch Target Identification Armv8.1-M Mechanism > [1]. > > This is achieved by using the bti pass made common with Aarch64. > > The pass iterates through the instructions and adds the necessary BTI > instructions at the beginning of every function and at every landing > pads targeted by indirect jumps. > > Best Regards > > Andrea > > [1] > > > gcc/ChangeLog > > 2022-04-07 Andrea Corallo > > * config.gcc (arm*-*-*): Add 'aarch-bti-insert.o' object. > * config/arm/arm-protos.h: Update. > * config/arm/arm.cc (aarch_bti_enabled, aarch_bti_j_insn_p) > (aarch_pac_insn_p, aarch_gen_bti_c, aarch_gen_bti_j): New > functions. > * config/arm/arm.md (bti_nop): New insn. > * config/arm/t-arm (PASSES_EXTRA): Add 'arm-passes.def'. > (aarch-bti-insert.o): New target. > * config/arm/unspecs.md (UNSPEC_BTI_NOP): New unspec. > * config/arm/aarch-bti-insert.cc (rest_of_insert_bti): Update > to verify arch compatibility. > * config/arm/arm-passes.def: New file. > > gcc/testsuite/ChangeLog > > 2022-04-07 Andrea Corallo > > * gcc.target/arm/bti-1.c: New testcase. > * gcc.target/arm/bti-2.c: Likewise. Ping Andrea